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docs: improve documentation of pg_basebackup_options

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Ian Barwick
2017-11-15 20:50:13 +09:00
parent 9124e0f0a2
commit 2ad174489c
2 changed files with 27 additions and 5 deletions
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15
doc/appendix-faq.sgml
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@@ -142,7 +142,7 @@
<title>I've provided replication permission for the <literal>repmgr</literal> user in <filename>pg_hba.conf</filename>
but <command>repmgr</command>/<application>repmgrd</application> complains it can't connect to the server... Why?</title>
<para>
<command>repmgr</command> and<application>repmgrd</application> need to be able to connect to the repmgr database
<command>repmgr</command> and <application>repmgrd</application> need to be able to connect to the repmgr database
with a normal connection to query metadata. The <literal>replication</literal> connection
permission is for PostgreSQL's streaming replication (and doesn't necessarily need to be the <literal>repmgr</literal> user).
</para>
@@ -155,8 +155,17 @@
Cloning a standby is a one-time action; the role of the server being cloned
from could change, so fixing it in the configuration file would create
confusion. If &repmgr; needs to establish a connection to the primary
server, it can retrieve this from the <literal>repmgr.nodes</literal> table or if necessary
scan the replication cluster until it locates the active primary.
server, it can retrieve this from the <literal>repmgr.nodes</literal> table on the local
node, and if necessary scan the replication cluster until it locates the active primary.
</para>
</sect2>
<sect2 id="faq-repmgr-clone-waldir-xlogdir" xreflabel="Providing a custom WAL directory">
<title>When cloning a standby, how do I ensure the WAL files are placed in a custom directory?</title>
<para>
Provide the option <literal>--waldir</literal> (<literal>--xlogdir</literal> in PostgreSQL 9.6
and earlier) with the absolute path to the WAL directory in <varname>pg_basebackup_options</varname>.
For more details see <xref linkend="cloning-advanced-pg-basebackup-options">.
</para>
</sect2>

17
doc/cloning-standbys.sgml
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@@ -347,6 +347,11 @@
<sect2 id="cloning-advanced-pg-basebackup-options" xreflabel="pg_basebackup options when cloning a standby">
<title>pg_basebackup options when cloning a standby</title>
<para>
As &repmgr; uses <command>pg_basebackup</command> to clone a standby, it's possible to
provide additional parameters for <command>pg_basebackup</command> to customise the
cloning process.
</para>
<para>
By default, <command>pg_basebackup</command> performs a checkpoint before beginning the backup
process. However, a normal checkpoint may take some time to complete;
@@ -362,8 +367,16 @@
</simpara>
</tip>
<para>
Further options can be passed to the <command>pg_basebackup</command> utility via
the setting <varname>pg_basebackup_options</varname> in <filename>repmgr.conf</filename>.
Other options can be passed to <command>pg_basebackup</command> by including them
in the <filename>repmgr.conf</filename> setting <varname>pg_basebackup_options</varname>.
</para>
<para>
If using a separate directory to store WAL files, provide the option <literal>--waldir</literal>
(<literal>--xlogdir</literal> in PostgreSQL 9.6 and earlier) with the absolute path to the
WAL directory. Any WALs generated during the cloning process will be copied here, and
a symlink will automatically be created from the main data directory.
</para>
<para>
See the <ulink url="https://www.postgresql.org/docs/current/static/app-pgbasebackup.html">PostgreSQL pg_basebackup documentation</ulink>
for more details of available options.
</para>